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This goes for all VIN - U GM Vehicles with-in a few years.
This is the most commonly seen cause and does not apply to every "U-boat" as I like to refer to them as.
You need to get under the carpet, right - passengers' side, front seat area.
You will need to gently pry up the sill plate, the sill plate is what holds the carpet down and you will see it with the front passenger's door - open.
Then to do it right you should also remove the Kick-panel, that's right, it's what your right foot touches when sitting in the front passenger's seat. This allows the carpet to be lifted with ease, it is also easy to break one of the 2 retainers so go easy. In colder weather its best to warm the inside of the vehicle before working with Plastic.
Okay, now just lift up on the carpet, no need to remove the seat, look for the wire harness running along the carpet edge, near the sill plate that was removed.
Most often the floor will be wet, now just start removing the electrical tape and look for splices (were 3-4 wires come together) and most ofter white colored wires but don't over look other colors, I'm thinking light-blue but can't remember for sure.
gently tug on the spiced wires, when you find a splice that pulls apart you most likely have found the reason the power door locks will not lock or unlock, (one direction usually works fine, lock or unlock).
Cut the spliced wires back and resplice them together, I use a piece of wire added to ease the soldering job, and shrink warp. Re-tape the harness and be sure it's tucked back in place After checking to be sure the locks work when using both front door lock switches - Don't forget.....the locks can be programmed to work differently with 4 modes so don't confuse this with an inop. door lock.
Why's the floor wet ? That's a different problem that needs fixing - be sure to check the a/c - heater case drain for blockage (lint)....
Dave Hamilton - Master ASE Auto Technician
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